TIAGO

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1.2L REVOTRON ENGINE
68
K. Crankshaft :
NOTE
 Connecting rod bearing shells are precision
finished and should not be bored or
scraped.
1. Carry out visual inspection of the crankshaft
for the following :
 Overheating of journals – indicated by
bluish brown color.
 Scoring marks on journals
 Using magnetic crack detector, check for
cracks.
2. Place crankshaft on V-block, and check for
run out on 1st and 5th bearing journals.
3. If the run out exceeds permissible limits,
using a press carefully straighten the
crankshaft in cold condition.
4. Check lateral and radial run out of flywheel
mounting flange/
5. Check dimensions of crankshaft main bearing
and crank pin journals. (Grind if necessary,
crankshaft main bearing and crank pin
journals to the next under size.)
NOTE
 Maintain correct fillet radii for journals.
 Width of journals should not increase
during grinding.
6. If the 4th main bearing has to be ground, then
grind it to next oversize.
7. Always re-chamfer oil holes on journals to
avoid scoring of new bearing shells.
8. Clean oil holes with wire brush.
9. Finish journals by covering with 320 grit
lapping cloth of suitable width.
10. Re-check main bearing, crank pin journal
dimensions and run out of crank shaft.
11. Clean crankshaft with suitable cleansing
agent.
NOTE
 After grinding, re-check crankshaft for
cracks and balance.
 Crankshaft must always be stored in
vertical position.
 All machined surfaces should be greased.
Crank Bore Diameter (mm)
M 52.000 - 52.009
N 52.010 - 52.019
Crank Journal Diameter (mm)
E 44.986 - 44.978
D 44.977 - 44.970
Main Bearing Grade
Blue
Red
Yellow